Design actions taken to reduce the Severity, Occurrence, and/or Detection ratings.
Remedial design actions should be considered in the following order:
A Failure Mode has an effect with a Severity rating of 9 or 10.
A Failure Mode/Cause combination has a high Severity and Occurrence rating (based on Team consensus).
A Failure Mode/Cause/Design Control and Machinery Control combination has a high RPN rating (based on Team consensus).
The intent of design actions is to reduce the Severity, Occurrence and Detection ratings, in that order.
Whenever failure mode/cause combinations have Severity ratings of 9 or 10, design actions must be considered before engineering release to eliminate a safety concern. For these ratings, the goal is to reduce criticality below conditions that could adversely affect the safety of the operator.